Answer Posted / raju chetiar

Normally Neutral conductor is 1/2 the size of other
conductor.It is theoraticaly expalin that In a three phase
circuit ( Equal load in all three phasse) there will be
Zero current in Neutral, Ex. 3phase indusction load (Motor)
(NO NEUTRAL CONNECTED T OANY MOTORS AS THE RESISTANCE OF
THE THREE WINDINGS ARE EQAL).
But in a three phase to single phase distribution
(Resistive loads) it is not possible to maintain the equal
load in all three phases hence the unbalance current has to
be taken away from the circuit for the healthy opertion of
the equipmetns.
Thearitically and also practically it is prooved that the
flow of unbalance current in the 3 phase resistive load
distribution is always less than 1/2 of the phase current.
So 1/2 caore has been taken as a neutral

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